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单词 metallic return
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metallic return
metallic return n. Telegraphy the wire completing a metallic circuit.
ΚΠ
1928 A. Williams Telegr. & Telephony ix. 131 The first telephone companies had a hard fight to interest the public in their services, and to keep down costs—which would have been nearly doubled by a metallic return—only one wire was used for each subscriber.
extracted from metallicadj.n.
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